Results 21 to 30 of about 89,419 (201)

Quantum Fields in Nonstatic background: A Histories Perspective

, 1999
For a quantum field living on a non - static spacetime no instantaneous Hamiltonian is definable, for this generically necessitates a choice of inequivalent representation of the canonical commutation relations at each instant of time. This fact suggests
Anastopoulos C., Ashtekar A., C. Anastopoulos, Calzetta E., Calzetta E., Calzetta E., Davies P. C. W., Fulling S. A., Keldysh L. V., Klauder J. R., Schreckenberg S., Schreckenberg S., Schwinger J. S., Sorkin R. D.   +13 more
core   +2 more sources

An intracellular transporter mitigates the CO2‐induced decline in iron content in Arabidopsis shoots

FEBS Letters, EarlyView.
This study identifies a gene encoding a transmembrane protein, MIC, which contributes to the reduction of shoot Fe content observed in plants under elevated CO2. MIC is a putative Fe transporter localized to the Golgi and endosomal compartments. Its post‐translational regulation in roots may represent a potential target for improving plant nutrition ...
Timothy Mozzanino, Meijie Li, Cécile Fizames, Mattia Adamo, Laurence Lejay, Christian Dubos, Matthieu Platre, Antoine Martin   +7 more
wiley   +1 more source

Third-Order Tensors as Linear Operators on a Space of Matrices

Linear Algebra and its Applications, 2010
AbstractA recently proposed tensor-tensor multiplication (M.E. Kilmer, C.D. Martin, L. Perrone, A Third-Order Generalization of the Matrix SVD as a Product of Third-Order Tensors, Tech. Rep. TR-2008-4, Tufts University, October 2008) opens up new avenues to understanding the action of n×n×n tensors on a space of n×n matrices.
openaire   +1 more source

By dawn or dusk—how circadian timing rewrites bacterial infection outcomes

FEBS Letters, EarlyView.
The circadian clock shapes immune function, yet its influence on infection outcomes is only beginning to be understood. This review highlights how circadian timing alters host responses to the bacterial pathogens Salmonella enterica, Listeria monocytogenes, and Streptococcus pneumoniae revealing that the effectiveness of immune defense depends not only
Devons Mo, Catherine S. Palmer, Jacqueline M. Kimmey   +2 more
wiley   +1 more source

Theoretical framework for quantum networks

, 2009
We present a framework to treat quantum networks and all possible transformations thereof, including as special cases all possible manipulations of quantum states, measurements, and channels, such as, e.g., cloning, discrimination, estimation, and ...
A. S. Holevo, C. W. Helstrom, D. Aharonov, E. B. Davies, G. Gutoski, Giacomo Mauro D’Ariano, Giulio Chiribella, I. L. Chuang, K. Kraus, M. A. Naimark, Paolo Perinotti, V. I. Paulsen   +11 more
core   +1 more source

Interplay between circadian and other transcription factors—Implications for cycling transcriptome reprogramming

FEBS Letters, EarlyView.
This perspective highlights emerging insights into how the circadian transcription factor CLOCK:BMAL1 regulates chromatin architecture, cooperates with other transcription factors, and coordinates enhancer dynamics. We propose an updated framework for how circadian transcription factors operate within dynamic and multifactorial chromatin landscapes ...
Xinyu Y. Nie, Jerome S. Menet
wiley   +1 more source

Mechanisms of parasite‐mediated disruption of brain vessels

FEBS Letters, EarlyView.
Parasites can affect the blood vessels of the brain, often causing serious neurological problems. This review explains how different parasites interact with and disrupt these vessels, what this means for brain health, and why these processes matter. Understanding these mechanisms may help us develop better ways to prevent or treat brain infections in ...
Leonor Loira, Sílvia Arroz‐Madeira, Cláudio A. Franco, Sara Silva Pereira   +3 more
wiley   +1 more source

BRST Cohomology and Phase Space Reduction in Deformation Quantisation

, 1999
In this article we consider quantum phase space reduction when zero is a regular value of the momentum map. By analogy with the classical case we define the BRST cohomology in the framework of deformation quantization.
Bordemann, Martin, Herbig, Hans-Christian, Waldmann, Stefan   +2 more
core   +3 more sources

Time after time – circadian clocks through the lens of oscillator theory

FEBS Letters, EarlyView.
Oscillator theory bridges physics and circadian biology. Damped oscillators require external drivers, while limit cycles emerge from delayed feedback and nonlinearities. Coupling enables tissue‐level coherence, and entrainment aligns internal clocks with environmental cues.
Marta del Olmo, Carolin Ector, Hanspeter Herzel   +2 more
wiley   +1 more source

On the first eigenvalue of the linearized operator of the higher order mean curvature for closed hypersurfaces in space forms

Illinois Journal of Mathematics, 2004
Let \(M^n\) be a closed hypersurface immersed into an \((n+1)\)-dimensional Riemannian space form \(M^{n+1}\). The authors give sharp upper bounds for the first positive eigenvalue of the linearized operator of the higher order mean curvature of \(M^n\).
Alías, Luis J., Malacarne, J. Miguel
openaire   +3 more sources